Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40ac6308c96378b…

MALICIOUS

PDF

86.7 KB Created: 2021-09-17 17:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cbe3fd9f6e25e75c29f64f33e3073b0c SHA-1: 02c7218226f64553309f3d86c35ae43509af5282 SHA-256: e40ac6308c96378bb5365338356db8182c79392a68331bfe123f9eb217d25ab4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to numerous external URLs, some hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may exploit PDF vulnerabilities or serve as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://penzionradvanice.cz/res/file/40842354051.pdf In PDF document text
    • http://carbonelite.ru/file/28382720561.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/bifitimuvagiraga.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5a9e48f0---dopanalojepuvodena.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-4/20210904164550227308.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/76562905888.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133f77fcfd42---74847427283.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630644603.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/5512084032.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc310b6135---10268472983.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/91711658246.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8976826f84bcea0f734cb551c4d702ad/xadugofajusotaduvile.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109062317305393.pdfIn PDF document text
    • http://speckrepej.com/upload/file/17508240384.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/bigewefo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fuxudilewuxedisetagew.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/madamoditewinopebi.pdfIn PDF document text
    • http://plise.org/userfiles/file/nudaruwagugikagixadukeji.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/38144232350.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf7452a31---naxotalewif.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/kazarezigo.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/18813075874.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/mizigolajagifeluta.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/14477932274.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/39592627082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=black+panther+2018+putlockerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 10956 bytes
SHA-256: 408ca2da61d896c94166c893b272e6956322afea66e2b653d877a5eb738ec2e6
font_01_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 20976 bytes
SHA-256: 2056675d144e3358c91e836a248f384c388f32e099884e2a403e0c37c5934f78
font_02_sfnt_off00013514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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